First of all, the difference in the jump is quite small. The difference in Maximum OverAll Length between the .357Mag and the .38Spl is only...as the shorter cartridge's bullet "jumps" further than the 357 cartridge's bullet prior to entering the forcing cone of the barrel.
So in practice, the bullet jump difference is going to be very small and it's even possible (though, perhaps unlikely) that a particular .38Spl loading with a heavy bullet seated out to maximum length could have a longer overall length (and therefore a shorter jump) than a light bullet loading for the .357Mag with the bullet seated deeply into the case.
Second, I'm curious how a difference in the bullet jump before the rifling engages is supposed to translate into a noticeable difference in point of impact on the target.
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